<?php
    // +----------------------------------------------------------------------
    // | ThinkPHP [ WE CAN DO IT JUST THINK ]
    // +----------------------------------------------------------------------
    // | Copyright (c) 2006~2015 http://thinkphp.cn All rights reserved.
    // +----------------------------------------------------------------------
    // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
    // +----------------------------------------------------------------------
    // | Author: yunwuxin <448901948@qq.com>
    // +----------------------------------------------------------------------
    namespace think\console\input;
    class Option {
        const VALUE_NONE     = 1;
        const VALUE_REQUIRED = 2;
        const VALUE_OPTIONAL = 4;
        const VALUE_IS_ARRAY = 8;
        private $name;
        private $shortcut;
        private $mode;
        private $default;
        private $description;

        /**
         * 构造方法
         * @param string       $name        选项名
         * @param string|array $shortcut    短名称,多个用|隔开或者使用数组
         * @param int          $mode        选项类型(可选类型为 self::VALUE_*)
         * @param string       $description 描述
         * @param mixed        $default     默认值 (类型为 self::VALUE_REQUIRED 或者 self::VALUE_NONE 的时候必须为null)
         * @throws \InvalidArgumentException
         */
        public function __construct($name, $shortcut = null, $mode = null, $description = '', $default = null) {
            if (0 === strpos($name, '--')) {
                $name = substr($name, 2);
            }
            if (empty($name)) {
                throw new \InvalidArgumentException('An option name cannot be empty.');
            }
            if (empty($shortcut)) {
                $shortcut = null;
            }
            if (null !== $shortcut) {
                if (is_array($shortcut)) {
                    $shortcut = implode('|', $shortcut);
                }
                $shortcuts = preg_split('{(\|)-?}', ltrim($shortcut, '-'));
                $shortcuts = array_filter($shortcuts);
                $shortcut  = implode('|', $shortcuts);
                if (empty($shortcut)) {
                    throw new \InvalidArgumentException('An option shortcut cannot be empty.');
                }
            }
            if (null === $mode) {
                $mode = self::VALUE_NONE;
            } elseif (!is_int($mode) || $mode > 15 || $mode < 1) {
                throw new \InvalidArgumentException(sprintf('Option mode "%s" is not valid.', $mode));
            }
            $this->name        = $name;
            $this->shortcut    = $shortcut;
            $this->mode        = $mode;
            $this->description = $description;
            if ($this->isArray() && !$this->acceptValue()) {
                throw new \InvalidArgumentException('Impossible to have an option mode VALUE_IS_ARRAY if the option does not accept a value.');
            }
            $this->setDefault($default);
        }

        /**
         * 选项值是否接受数组
         * @return bool 类型是 self::VALUE_IS_ARRAY 的时候返回true,其他均返回false
         */
        public function isArray() {
            return self::VALUE_IS_ARRAY === (self::VALUE_IS_ARRAY & $this->mode);
        }

        /**
         * 是否可以设置值
         * @return bool 类型不是 self::VALUE_NONE 的时候返回true,其他均返回false
         */
        public function acceptValue() {
            return $this->isValueRequired() || $this->isValueOptional();
        }

        /**
         * 是否必须
         * @return bool 类型是 self::VALUE_REQUIRED 的时候返回true,其他均返回false
         */
        public function isValueRequired() {
            return self::VALUE_REQUIRED === (self::VALUE_REQUIRED & $this->mode);
        }

        /**
         * 是否可选
         * @return bool 类型是 self::VALUE_OPTIONAL 的时候返回true,其他均返回false
         */
        public function isValueOptional() {
            return self::VALUE_OPTIONAL === (self::VALUE_OPTIONAL & $this->mode);
        }

        /**
         * 获取描述文字
         * @return string
         */
        public function getDescription() {
            return $this->description;
        }

        /**
         * 检查所给选项是否是当前这个
         * @param Option $option
         * @return bool
         */
        public function equals(Option $option) {
            return $option->getName() === $this->getName() && $option->getShortcut() === $this->getShortcut() && $option->getDefault() === $this->getDefault() && $option->isArray() === $this->isArray() && $option->isValueRequired() === $this->isValueRequired() && $option->isValueOptional() === $this->isValueOptional();
        }

        /**
         * 获取选项名
         * @return string
         */
        public function getName() {
            return $this->name;
        }

        /**
         * 获取短名称
         * @return string
         */
        public function getShortcut() {
            return $this->shortcut;
        }

        /**
         * 获取默认值
         * @return mixed
         */
        public function getDefault() {
            return $this->default;
        }

        /**
         * 设置默认值
         * @param mixed $default 默认值
         * @throws \LogicException
         */
        public function setDefault($default = null) {
            if (self::VALUE_NONE === (self::VALUE_NONE & $this->mode) && null !== $default) {
                throw new \LogicException('Cannot set a default value when using InputOption::VALUE_NONE mode.');
            }
            if ($this->isArray()) {
                if (null === $default) {
                    $default = [];
                } elseif (!is_array($default)) {
                    throw new \LogicException('A default value for an array option must be an array.');
                }
            }
            $this->default = $this->acceptValue() ? $default : false;
        }
    }
